The shear test of 0.20–0.65 mm electrical steel sheet was carried out at the same relative lateral clearance and shear rate, The morphology of the specimen after shearing was detected by SEM and white light interferometer (2D/3D). The results show: Under the same relative backlash, the thinner thickness of the plate, the greater relative height of rollover, the narrower relative height of shear zone, the wider relative height of fracture zone, and the greater fracture angle, the more rough the fracture surface, the more obvious the dimples feature.